Connecting rod joint



Oct. 30, 195] G. I. DANLY ET AL 5 5 CONNECTING ROD JOINT Original Filed Nov. 3, 1947 INVENTOR. .7 Gsoieae I Dmvzr 22 By M45 6502655 Patented Oct. 30, 1951 Chicago, Ill; assignors tcfi'Danly Machine S ci ies. 131%. Chi a III. a: corporation of I i o s- Original; application November 3; 1947 SeriaIjNo. 783,749) Dividedand this application- July 21, 1949, Serial NDL'IQGQOGG Our invention relates to connecting rod joints, andgmore particularly to an improved joint between the pitman and ram of a power press.

This application is a division of our copending application Serial No. 783,74 9.,f or an. adjustable press ram, filed November" 3,.1947Lnow-Patent No. 2,511,978.

In power presses large forces arepresent and the entire thrust must be transmitted to the ram tlmough its Joint. to. therpitmamy So great.:are the forces involved, especially at times when the press is inadvertently overloaded, that failures have occurred. It has been the practice in the prior art to provide a knee joint to avoid bent or broken wrist pins. The construction of a knee joint at the lower end of a pitman involves a diflicult and expensive machining operation. The external surface of the lower end of the pitman must be finish-machined and inasmuch as pitmans of power presses are frequently heavy and large pieces, not only is the machining difficult but it requires expensive equipment. Then too the external surface must be machined concentrio with the internal bearing surface through which the wrist pin passes, adding to the difficulty and expense of the construction.

One object of our invention is to provide an improved connectin rod joint between the pitman and a reciprocating part of a power press which will transmit the thrust of the press through a wrist pin in a manner to avoid the bending or breaking of wrist pins.

Another object of our invention is to provide a. strong and simple connecting rod joint with the use of a wrist pin and avoiding the expensive knee joint which is commonly used in the prior art.

Other and further objects of our invention will appear from the following description.

In the accompanying drawings which form part of the instant specification and which are to be read in conjunction therewith, and in which like reference numerals are used to indicate like parts in the various views:

Figure 1 is a side elevation of our: improved rod joint with parts in section.

Figure 2 is a front elevation of our improved rod joint with parts in section.

. Figure 3 is a perspective view showing the bearing bushing used in our joint.

In general our improved joint employs a wrist pin which coacts with a bifurcated pitman end, thus enabling us to support the wrist pin not only adjacent its ends but also intermediate thereof. A bronze bearing bushing having the gowns... (create-e ber [0 passes.

central portion removed. to accommodate the. intermediate'pin bearing is provided. The thrust ofrpthe press; is; tra'nemittedv through the pinv and bushing. witmthepinabeing, supported during it v heavy loading in such a manner as. to preclude he dan erzofpbending. or deflecting the pin.

More particularly referrin now to the: draw.-

ings, apitman 4 is: formed with its lower end bi urca d to pr vide a ai of se m s.- 6 and Themember' lil which isadapted to reciprocate,

forms part of an adjustable connection between the pitman and the ram, which connection is the subject of our copending application Serial No. 783,749. It is to be understood that the member In to which the pitman 4 is connected may be any suitable reciprocating member. The member I0 is formed with a pair of recesses I2 and I4, there being an intermediate bridgeportion IS. The member ID and the lower end of the pitman 4 are provided with openings through which the wrist pin l8 passes. A bearing bushing 20 is positioned around the wrist pin l8 and contacts the inner or working surface of the opening formed at the lower end of the pitman 4. The bushing 20 which can be seen in Figure 3 is provided with a segmental opening 22 through which the bridge [6 of the mem- The upper end of the bridge [6 is machined to a working surface and is adapted to bear against the wrist pin [8 and support it intermediate its ends. The pin may be of hardened steel and ground to have an external diameter adapted to fit the internal diameter of the bushing 20 which may be made of bronze. As will readily be seen by reference to Figure 2, the downward thrust of the pitman 4 is transmitted by the upper portion of the bushing 20 to the wrist pin i8 and is transmitted through the wrist pin to the member In. Since the wrist pin is supported adjacent its right end by the portion 24 of the member ID, at its left hand end by the portion 26 of the member In, and intermediate its ends by the bridge I6, the thrust will be readily transmitted through the wrist pin with no danger of its deflection. During the working stroke of the press the thrust is transmitted through a well supported wrist pin. Separated sections 28 and 30 of the bushing coacting with the segments 6 and 8 of the pitman transmits the upward force to the wrist pin, which during its upward motion is supportedonly adjacent its ends. The forces involved in the upward motion, however, are of small order compared with those existing during the working stroke of the press, so that during this motion the support of the wrist pin at two points only is ample.

supported during the working stroke by the pro-f.

vision of an increased bearing surface. Through the use of our improved joint we have obviated l the necessity of using an expensive knee joint which is so difficult to construct. We have eliminated further the necessityof two con-.

the .branches ofsaid bifurcated end, and a pin centric finish-machined surfaces'which advan-.

tage alone makes our construction more economi cal than that of the prior art using knee joints. It will be understood that certain features and sub-combinations are of utility and may be eIn-Y played without reference to other features and sub-combinations. is within the scope of our claims. It is further obvious that various changes may be made in details within the scope of our claims without departing from the spirit of our invention. It is, therefore, to'be understood that our invention is not to be limited to the specific details shown and described.

Having thus described. our inventionrwhat we claim is':": Y '1 In a power" press, a pitman and a' reciprocati-ng'membe'r, said pitman being formed with a bifurcated lower end, said reciprocating -member being formed with recesses adapted to receive the branches of said bifurcated end, and a pin pivotally connecting said bifurcated end to said reciprocating member, the lower portion of said pin being supported by said'reciprocatin member adjacent its ends and intermediate thereof.

2. In a power press, a pitman and a reciprocatirig member, said pitman being formed with a bifurcated lower end, said reciprocating member being formed with recesses adapted to receive pivotally 'connect'ing said bifurcated end to said reciprocating member, the lower portion of said pin being supported by said reciprocating member adjacentits ends and intermediate thereof,

a bearing bushing surrounding said pin, said .1 bushing having a segment thereof removed to This is contemplated by and g a reciprocating member permit the intermediate bearing portion of said ,to make contact with i pin- V GEORGE I. DANLY.

VASIL GEORGEFF.

; 7 REFERENCES CITED J The, following references are of record in'thej file 'ofthis patent:

UNITED STATES PATENTS 7 Number Name Date 1 

